Fix the MSDOS build

* msdos/sedlibmk.inp (GL_GNULIB_STDC_[^ =] &c.): Rename from
GL_STDC_... and define to 1 before other variables prefixed
GL_GNULIB_ are defined to 0.
(NEXT_AS_FIRST_DIRECTIVE_STDBIT_H)
(NEXT_AS_FIRST_DIRECTIVE_STDCOUNTOF_H, STDCOUNTOF_H): Define.
(GL_HAVE_STDBIT_H_CONDITION): Replace
GL_GENERATE_STDBIT_H_CONDITION.
(CXX_HAVE_STDCOUNTOF_H, GL_GNULIB_STREQ, GL_GNULIB_MEMEQ)
(GL_GNULIB_STRNUL, GL_GENERATE_STDCOUNTOF_H_CONDITION):
Substitute "1".

* src/conf_post.h (_REGEX_AVOID_UCHAR_H) [MSDOS]: Define to 1.

* src/term.c (init_tty) [MSDOS]: Set TN_max_colors to 16,
which was deleted inadvertently with recent MS Windows
modifications.

* config.bat: Rename stdcountof.in.h appropriately.

4 files changed, 26 insertions, 5 deletions

diff --git a/config.bat b/config.bat
index 91d41f8fbfb..c52410929ef 100644
--- a/config.bat
+++ b/config.bat
@@ -292,6 +292,7 @@ If Exist limits.in.h update limits.in.h limits.in-h
 If Exist signal.in.h update signal.in.h signal.in-h

 If Exist signal.in.h update signal.in.h signal.in-h

 If Exist stdalign.in.h update stdalign.in.h stdalign.in-h

+If Exist stdcountof.in.h update stdcountof.in.h stdcountof.in-h

 If Exist stddef.in.h update stddef.in.h  stddef.in-h

 If Exist stdint.in.h update stdint.in.h  stdint.in-h

 If Exist stdio.in.h update stdio.in.h stdio.in-h

diff --git a/msdos/sedlibmk.inp b/msdos/sedlibmk.inp
index d29fc6ebca7..f742db263fe 100644
--- a/msdos/sedlibmk.inp
+++ b/msdos/sedlibmk.inp
@@ -50,6 +50,14 @@
 #       s/^@GL_GENERATE_STDBOOL_H@/1/
 #       s/^@GL_GENERATE_STDINT_H@//
 #
+#  . Functions defined in these headers may also be conditional upon
+#    variables substituted into the generated products bearing the
+#    prefix GL_GNULIB_.  Be certain to examine updates to gnulib.mk for
+#    any variables of this description, and edit them to 1 if the
+#    functions they control must be defined, e.g.:
+#
+#       /^GL_GNULIB_STREQ *=/s/@GL_GNULIB_STREQ@/1/
+#
 #  . Also edit the NEXT_foo_H and NEXT_AS_FIRST_DIRECTIVE_foo_H
 #    variables as appropriately: to an empty value if the gnulib
 #    header is not used, and to the corresponding DJGPP header name
@@ -170,6 +178,7 @@ s/@PACKAGE@/emacs/
 /^BITSIZEOF_WCHAR_T *=/s/@BITSIZEOF_WCHAR_T@/16/
 /^BITSIZEOF_WINT_T *=/s/@BITSIZEOF_WINT_T@/32/
 /^APPLE_UNIVERSAL_BUILD *=/s/@APPLE_UNIVERSAL_BUILD@/0/
+/^CXX_HAVE_STDCOUNTOF_H *=/s/@CXX_HAVE_STDCOUNTOF_H@/0/
 # Most GL_GNULIB_* are replaced with zero even though DJGPP does not
 # have these features.  That's because the gnulib replacements cannot
 # possibly work for DJGPP, so we prefer to fail the link than have a
@@ -186,10 +195,12 @@ s/@PACKAGE@/emacs/
 /^GL_GNULIB_MEMMEM *=/s/@GL_GNULIB_MEMMEM@/1/
 /^GL_GNULIB_MEMRCHR *=/s/@GL_GNULIB_MEMRCHR@/1/
 /^GL_GNULIB_MEMPCPY *=/s/@GL_GNULIB_MEMPCPY@/1/
+/^GL_GNULIB_MEMEQ *=/s/@GL_GNULIB_MEMEQ@/1/
 /^GL_GNULIB_MKOSTEMP *=/s/@GL_GNULIB_MKOSTEMP@/1/
 /^GL_GNULIB_MKTIME *=/s/@GL_GNULIB_MKTIME@/1/
 /^GL_GNULIB_SIGDESCR_NP *=/s/@GL_GNULIB_SIGDESCR_NP@/1/
-/^GL_GNULIB_STRINGEQ *=/s/@GL_GNULIB_STRINGEQ@/1/
+/^GL_GNULIB_STREQ *=/s/@GL_GNULIB_STREQ@/1/
+/^GL_GNULIB_STRNUL *=/s/@GL_GNULIB_STRNUL@/1/
 /^GL_GNULIB_TIME_R *=/s/@GL_GNULIB_TIME_R@/1/
 /^GL_GNULIB_TIMEGM *=/s/@GL_GNULIB_TIMEGM@/1/
 /^GL_GNULIB_TIME_RZ *=/s/@GL_GNULIB_TIME_RZ@/1/
@@ -197,10 +208,10 @@ s/@PACKAGE@/emacs/
 # Apparently without this `rawmemchr' isn't declared, so
 # we get warnings building canonicalize-lgpl.o
 /^GL_GNULIB_RAWMEMCHR *=/s/@GL_GNULIB_RAWMEMCHR@/1/
-/^GL_GNULIB_[^ =]* *= *@/s/@[^@\n]*@/0/
 # These variables control whether ISO C23 features are generated,
 # e.g. those in stdbit.h.
-/^GL_STDC_[^ =]* *= *@/s/@[^@\n]*@/1/
+/^GL_GNULIB_STDC_[^ =]* *= *@/s/@[^@\n]*@/1/
+/^GL_GNULIB_[^ =]* *= *@/s/@[^@\n]*@/0/
 /^GL_GSETTINGS_CFLAGS *=/s/@[^@\n]*@//
 /^GL_GSETTINGS_LIBS *=/s/@[^@\n]*@//
 # Miscellaneous variables.
@@ -288,13 +299,15 @@ s/@PACKAGE@/emacs/
 # are created in config.bat!)
 /^MKDIR_P *=/s/@MKDIR_P@/echo/
 /^NEXT_AS_FIRST_DIRECTIVE_DIRENT_H *=/s/@[^@\n]*@/<dirent.h>/
-/^NEXT_AS_FIRST_DIRECTIVE_ERRNO_H *=/s/@[^@\n]*@//
 /^NEXT_AS_FIRST_DIRECTIVE_ENDIAN_H *=/s|@[^@\n]*@|<machine/endian.h>|
+/^NEXT_AS_FIRST_DIRECTIVE_ERRNO_H *=/s/@[^@\n]*@//
 /^NEXT_AS_FIRST_DIRECTIVE_FCNTL_H *=/s/@[^@\n]*@/<fcntl.h>/
 /^NEXT_AS_FIRST_DIRECTIVE_GETOPT_H *=/s/@[^@\n]*@/<getopt.h>/
 /^NEXT_AS_FIRST_DIRECTIVE_LIMITS_H *=/s/@[^@\n]*@/<limits.h>/
 /^NEXT_AS_FIRST_DIRECTIVE_SIGNAL_H *=/s/@[^@\n]*@/<signal.h>/
+/^NEXT_AS_FIRST_DIRECTIVE_STDBIT_H *=/s/@[^@\n]*@/<stdbit.h>/
 /^NEXT_AS_FIRST_DIRECTIVE_STDCKDINT_H *=/s/@[^@\n]*@/<stdckdint.h>/
+/^NEXT_AS_FIRST_DIRECTIVE_STDCOUNTOF_H *=/s/@[^@\n]*@/<stdcountof.h>/
 /^NEXT_AS_FIRST_DIRECTIVE_STDDEF_H *=/s/@[^@\n]*@/<stddef.h>/
 /^NEXT_AS_FIRST_DIRECTIVE_STDINT_H *=/s/@[^@\n]*@/<stdint.h>/
 /^NEXT_AS_FIRST_DIRECTIVE_STDIO_H *=/s/@[^@\n]*@/<stdio.h>/
@@ -359,6 +372,7 @@ s/@PACKAGE@/emacs/
 /^STDALIGN_H *=/s/@[^@\n]*@/stdalign.h/
 /^STDBIT_H *=/s/@[^@\n]*@/stdbit.h/
 /^STDCKDINT_H *=/s/@[^@\n]*@/stdckdint.h/
+/^STDCOUNTOF_H *=/s/@[^@\n]*@/stdcountof.h/
 /^STDDEF_H *=/s/@[^@\n]*@/stddef.h/
 /^STDDEF_NOT_IDEMPOTENT *=/s/@[^@\n]*@/1/
 /^STDINT_H *=/s/@[^@\n]*@/stdint.h/
@@ -448,6 +462,7 @@ s/= @GL_GENERATE_ENDIAN_H_CONDITION@/= 1/
 s/= @GL_GENERATE_EXECINFO_H_CONDITION@/= 1/
 s/= @GL_GENERATE_IEEE754_H_CONDITION@/= 1/
 s/= @GL_GENERATE_STDALIGN_H_CONDITION@/= 1/
+s/= @GL_GENERATE_STDCOUNTOF_H_CONDITION@/= 1/
 s/= @GL_GENERATE_STDDEF_H_CONDITION@/= 1/
 s/= @GL_GENERATE_STDINT_H_CONDITION@/= 1/
 s/= @GL_GENERATE_LIMITS_H_CONDITION@/= 1/
@@ -458,7 +473,7 @@ s/= @GL_GENERATE_GMP_H_CONDITION@/= 1/
 s/= @GL_GENERATE_GMP_GMP_H_CONDITION@/= /
 s/= @GL_GENERATE_MINI_GMP_H_CONDITION@/= 1/
 s/= @GL_GENERATE_STDCKDINT_H_CONDITION@/= 1/
-s/= @GL_GENERATE_STDBIT_H_CONDITION@/= 1/
+s/= @GL_HAVE_STDBIT_H_CONDITION@/= 0/
 s/= @GL_COND_OBJ_STDIO_READ_CONDITION@/= /
 s/= @GL_COND_OBJ_STDIO_WRITE_CONDITION@/= /
 s/= @GL_COND_OBJ_STPNCPY_CONDITION@/= /
diff --git a/src/conf_post.h b/src/conf_post.h
index 20a9ce2609b..e0bb753df56 100644
--- a/src/conf_post.h
+++ b/src/conf_post.h
@@ -386,6 +386,10 @@ extern int emacs_setenv_TZ (char const *);
     : S_ISLNK (mode) ? DT_LNK : S_ISBLK (mode) ? DT_BLK \
     : S_ISCHR (mode) ? DT_CHR : S_ISFIFO (mode) ? DT_FIFO \
     : S_ISSOCK (mode) ? DT_SOCK : DT_UNKNOWN)
+
+/* DJGPP doesn't provide uchar.h and Emacs doesn't import Gnulib's
+   replacement either.  */
+#define _REGEX_AVOID_UCHAR_H 1
 #endif /* MSDOS */
 
 #if defined WINDOWSNT && !(defined OMIT_CONSOLESAFE && OMIT_CONSOLESAFE == 1)
diff --git a/src/term.c b/src/term.c
index 2261293a60b..1a5ed74d698 100644
--- a/src/term.c
+++ b/src/term.c
@@ -4751,6 +4751,7 @@ use the Bourne shell command 'TERM=...; export TERM' (C-shell:\n\
     FrameCols (tty) = width;
     FrameRows (tty) = height;
     tty->char_ins_del_ok = 0;
+    tty->TN_max_colors = 16;  /* Must be non-zero for tty-display-color-p.  */
     init_baud_rate (fileno (tty->input));
   }
 #endif	/* MSDOS */